method for a class constructor

Hi guys,

As a novice, I can't find out (and believe me, I tried hard),how to
write the right method to construct a class.
Hereby a SSCCE, I guess this is the best way to explain what I mean.

<code>
public class test extends JFrame{

        alfa alf;
        beta bet;
        gamma gam;

        public test () {

alfa alf = new alfa(this,null);
beta bet = new beta(this,null,null);
gamma gam = new gamma(this,null);

alfa.setbeta(bet);
bet.setalpha(alf);
bet.setgamma(gam);
gam.setbeta(bet);

        <stuff>
    }
}

class alfa extends JPanel implements ActionListener {

    test ti;
    beta bet;

    public alfa (test ti, beta bet) {

  //??
        public void setbeta( <stuff>) {
            <stuff>
            }

        this.ti = ti;
        this.bet = bet;

        <stuff>
        }

}

class beta extends JPanel implements ActionListener{

    test ti;
    alfa alf;
    gamma gam;
    public beta(test ti,alfa alf, gamma gam) {

        //??
        public void setalfa(<stuff>) {
            <stuff>
        }

        //??
        public void setgamma(<stuff>) {
            <stuff>
            }

        this.gam = gam;
        this.ti = ti;
        this.alf=alf;

        <stuff>
        }
}

class gamma extends JPanel {

    test ti;
    beta bet;

    public gamma(test ti, beta bet) {

        //??
        public void setbeta(<stuff>) {
            <stuff>
            }
        this.ti=ti;
        this.bet=bet;
    <stuff>
    }
}

</code>

Tanks,